I have an idea for a move. It'll make Bug Pokemon actually stand a chance in a battle!

Move Name: Swarm
Move Type: Bug
Power: 65
Accuracy: 85
PP: 10
Effect: May cause foe to flinch. (50%)
Description: Summons a swarm of bug pokemon to attack the foe(s).
Category: Special
This is a field move, meaning it affects all pokemon on the field other than the user.

The animation could just be a bunch of tiny black dots with wings (like flies) come in from the left (in dispersed columns that go from top to bottom) and fly across the screen. This way, they cover all pokemon on the field, and it looks like a real swarm.